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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pkix;

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.KeyTransRecipientId;
import org.bouncycastle.cms.RecipientId;

/**
 * Holder class for public/private key based identity information.
 */
public class PKIXIdentity
{
    private final PrivateKeyInfo privateKeyInfo;
    private final X509CertificateHolder[] certificateHolders;

    public PKIXIdentity(PrivateKeyInfo privateKeyInfo, X509CertificateHolder[] certificateHolders)
    {
        this.privateKeyInfo = privateKeyInfo;
        this.certificateHolders = new X509CertificateHolder[certificateHolders.length];
        System.arraycopy(certificateHolders, 0, this.certificateHolders, 0, certificateHolders.length);
    }

    /**
     * Return the private key info for this identity.
     *
     * @return the identity's private key (if available, null otherwise).
     */
    public PrivateKeyInfo getPrivateKeyInfo()
    {
        return privateKeyInfo;
    }

    /**
     * Return the certificate associated with the private key info.
     *
     * @return a X509CertificateHolder
     */
    public X509CertificateHolder getCertificate()
    {
        return certificateHolders[0];
    }

    /**
     * Return a RecipientId for the identity's (private key, certificate) pair.
     */
    public RecipientId getRecipientId()
    {
        // TODO: handle key agreement
        return new KeyTransRecipientId(certificateHolders[0].getIssuer(), certificateHolders[0].getSerialNumber(), getSubjectKeyIdentifier());
    }

    private byte[] getSubjectKeyIdentifier()
    {
        SubjectKeyIdentifier subId = SubjectKeyIdentifier.fromExtensions(certificateHolders[0].getExtensions());

        if (subId == null)
        {
            return null;
        }

        return subId.getKeyIdentifier();
    }
}